CN219932723U - Slewing bearing - Google Patents

Abstract

The utility model provides a slewing bearing. The slewing bearing comprises an outer ring assembly, an inner ring, a main push roller assembly and a radial roller assembly, wherein the outer ring assembly is coaxially sleeved on the inner ring, the main push roller assembly and the radial roller assembly are arranged between the inner ring and the outer ring at intervals along the axial direction of the slewing bearing, the inner ring and the outer ring assembly are in rolling connection through the main push roller assembly and the radial roller assembly, and the inner ring at one side of the radial roller assembly, which is away from the main push roller assembly, is in sliding connection with the outer ring assembly; the main push roller assembly comprises a plurality of main push rollers, the main push rollers are arranged at intervals along the circumferential direction of the inner ring, the outer ring assembly is provided with a plurality of mounting grooves, and the main push rollers are embedded in the mounting grooves in a one-to-one correspondence manner; the radial roller assembly comprises a plurality of balls and a plurality of isolation blocks, and the balls and the isolation blocks are alternately arranged one by one along the circumferential direction of the inner ring. The slewing bearing provided by the utility model has longer service life.

Description

Slewing bearing

Technical Field

The utility model relates to the technical field of mechanical parts, in particular to a slewing bearing.

Background

The slewing bearing is a large or extra-large combined bearing with a gear ring, a multifunctional eyelet, an oil way and a sealing ring and capable of bearing axial force, radial force and overturning moment simultaneously.

The related art, the slewing bearing includes inner race, outer lane and bear roller subassembly, support roller subassembly and radial roller subassembly, and wherein bear roller subassembly and include a plurality of bearing rollers, a plurality of bearing rollers are spacing through first holder. The support roller assembly includes a plurality of support rollers that are restrained by the second cage. The radial roller assembly includes a plurality of radial rollers that are retained by a third cage.

However, the first cage, the second cage and the third cage all adopt sectional type, which is easy to cause the failure of the slewing bearing.

Disclosure of Invention

The utility model provides a slewing bearing, which aims to solve the technical problem that the slewing bearing is easy to fail.

The utility model provides a slewing bearing, which comprises an outer ring assembly, an inner ring, a main push roller assembly and a radial roller assembly, wherein the outer ring assembly is coaxially sleeved on the inner ring;

the main push roller assembly comprises a plurality of main push rollers, the main push rollers are arranged at intervals along the circumferential direction of the inner ring, the outer ring assembly is provided with a plurality of mounting grooves, and the main push rollers are embedded in the mounting grooves in a one-to-one correspondence manner;

the radial roller assembly comprises a plurality of balls and a plurality of isolation blocks, and the balls and the isolation blocks are alternately arranged one by one along the circumferential direction of the inner ring.

In one possible implementation manner, the slewing bearing provided by the utility model is characterized in that the outer wall of the inner ring on one side, facing away from the main push roller assembly, of the radial roller assembly is provided with a first meshing part, the inner wall of the outer ring assembly is provided with a second meshing part matched with the first meshing part, the first meshing part is in sliding connection with the second meshing part, and the first meshing part is meshed with the second meshing part.

In one possible implementation manner, the slewing bearing provided by the utility model has an included angle between the axial direction of the main pushing roller and the horizontal plane, and the included angle is not more than 45 degrees.

In one possible implementation manner, the slewing bearing provided by the utility model comprises a main push roller body and a shaping part arranged at two ends of the main push roller body, wherein the roller body is abutted with the inner ring.

In one possible implementation manner, the slewing bearing provided by the utility model comprises a main push roller body, wherein a bus bar comprises at least one first arc, the inner ring is provided with a first roller path, a molded line of the first roller path comprises at least one second arc, the first arc is arranged corresponding to the second arc, the middle point of the first arc coincides with the middle point of the corresponding second arc, and the curvature radius of the second arc is not equal to that of the corresponding first arc;

the inner wall of the mounting groove is provided with a second rollaway nest, the molded line of the second rollaway nest comprises at least one third arc, the first arc and the third arc are correspondingly arranged, the midpoint of the first arc coincides with the midpoint of the corresponding third arc, and the curvature radius of the third arc is not equal to the curvature radius of the corresponding first arc.

In one possible implementation manner, the slewing bearing provided by the utility model has two main push roller assemblies, and the two main push roller assemblies are arranged at intervals along the radial direction of the slewing bearing;

the number of the first rollaway nest is two, an arc-shaped part is connected between the two first rollaway nest, and the arc-shaped part and the outer ring component have a gap.

In one possible implementation manner, the slewing bearing provided by the utility model has two main push roller assemblies, and the outer ring assembly comprises a first outer ring, a second outer ring, a third outer ring and a flange;

the second meshing part is arranged on the inner wall of the third outer ring, and the third outer ring is in rolling connection with the inner ring through balls;

the bottom surface of the second outer ring is abutted with the top surface of the third outer ring, the bottom surface of the first outer ring is abutted with the top surface of the second outer ring, the top surface of the flange is abutted with the bottom surface of the first outer ring, the flange is positioned in the area surrounded by the inner ring, and the axes of the first outer ring, the second outer ring, the third outer ring and the flange are collinear;

the mounting groove corresponding to one main push roller assembly is formed by the second outer ring and the first outer ring, and the mounting groove corresponding to the other main push roller assembly is formed by the first outer ring and the flange.

In one possible implementation manner, the slewing bearing provided by the utility model further comprises a connecting piece, a first connecting hole is formed in the baffle edge, a second connecting hole matched with the first connecting hole is formed in the first outer ring, the first connecting hole and the second connecting hole are correspondingly arranged, and the connecting piece is inserted into the first connecting hole through the second connecting hole.

In a possible implementation manner, the slewing bearing provided by the utility model is characterized in that the outer wall of the inner ring is provided with a third slideway, the inner wall of the third outer ring is provided with a fourth slideway corresponding to the third slideway, the radial roller assembly is positioned in an area surrounded by the third slideway and the fourth slideway, each ball is provided with two abutting points with the third slideway, and each ball is provided with two abutting points with the fourth slideway.

In one possible implementation, the slewing bearing provided by the utility model is provided with a bevel gear on the inner wall of the inner ring.

According to the slewing bearing provided by the utility model, the outer ring component, the inner ring, the main push roller component and the radial roller component are arranged, the outer ring component is coaxially sleeved on the inner ring, the main push roller component and the radial roller component are arranged between the inner ring and the outer ring at intervals along the axial direction of the slewing bearing, the inner ring and the outer ring component are in rolling connection through the main push roller component and the radial roller component, and the inner ring at one side of the radial roller component, which is far away from the main push roller component, is in sliding connection with the outer ring component. In this way, the sliding connection is used instead of the rolling connection, so that the cage can be dispensed with. The main push roller assembly comprises a plurality of main push rollers, the main push rollers are arranged at intervals along the circumferential direction of the inner ring, a plurality of mounting grooves are formed in the outer ring assembly, and the main push rollers are embedded in the mounting grooves in a one-to-one correspondence manner. In this way, the retainer can be eliminated by restraining the main pushing roller with the mounting groove. The radial roller assembly comprises a plurality of balls and a plurality of isolation blocks, and the balls and the isolation blocks are alternately arranged one by one along the circumferential direction of the inner ring. In this way, the balls are restrained by the spacer, so that the cage can be eliminated. Therefore, the slewing bearing provided by the utility model can avoid the failure of the slewing bearing caused by the abnormal operation of the roller and the retainer in the related art by canceling the arrangement of the retainer.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a slewing bearing according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a radial roller assembly in a slewing bearing according to an embodiment of the present utility model;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

fig. 4 is a schematic structural diagram of a main pushing roller in a slewing bearing according to an embodiment of the present utility model;

fig. 5 is a partial enlarged view at B in fig. 4.

Reference numerals illustrate:

100-an outer ring assembly;

110-mounting slots;

120-a second engagement portion;

130-a first outer race;

140-a second outer race;

150-a third outer race;

160-flanges;

200-inner ring;

210-a first engagement portion;

300-a main push roller assembly;

310-main pushing roller;

311-main push roller body;

312-shaping part;

400-radial roller assembly;

410-balls;

420-isolating blocks;

500-bevel gears.

Detailed Description

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected via an intermediate medium, in communication with each other, or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms first, second, third and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or maintenance tool that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or maintenance tool.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the related art, the slewing bearing comprises an inner ring, an outer ring, a bearing roller assembly, a supporting roller assembly and a radial roller assembly, wherein the bearing roller assembly comprises a plurality of bearing rollers, and the plurality of bearing rollers are limited by a first retainer. The support roller assembly includes a plurality of support rollers that are restrained by the second cage. The radial roller assembly includes a plurality of radial rollers that are retained by a third cage.

However, for large diameter slewing bearings, the cage is difficult to make in one piece, and therefore segmented is often employed. That is, the first holder, the second holder, and the third holder are each of a sectional type. The segmented cage is easy to operate, and the segments collide with each other, so that the rollers collide with the cage. Therefore, the wear of the cage in the slewing bearing is extremely severe, and once the cage is out of order, the normal operation of the rollers is also disturbed, and the slewing bearing is likely to be jammed in the whole operation, thereby generating significant noise. The roller path is worn and increased due to abnormal operation between the roller and the retainer, microcracks are generated, and finally the failure of the slewing bearing is accelerated.

In order to solve the technical problems, the slewing bearing provided by the utility model cancels the arrangement of the retainer, thereby avoiding the failure of the slewing bearing caused by the abnormal operation of the roller and the retainer.

Furthermore, under the action of strong bending moment, the whole inner ring deflects, the contact between the roller and the rollaway nest changes, the load is changed from uniform distribution under normal conditions to partial unbalanced load of the roller, so that stress concentration is caused, the normal operation of the retainer and the roller is disturbed to generate inclined clamping phenomenon, and subsurface cracks are accelerated to generate at the local stress concentration position, so that the slewing bearing finally fails in advance.

In order to solve the technical problem, the slewing bearing provided by the utility model is characterized in that the outer ring and the inner ring are provided with the meshing teeth which are meshed with each other, so that deflection of the inner ring is limited.

Fig. 1 is a schematic structural view of a slewing bearing according to an embodiment of the present utility model, and fig. 2 is a schematic structural view of a radial roller assembly in a slewing bearing according to an embodiment of the present utility model.

Referring to fig. 1 and 2, the slewing bearing provided by the present utility model includes an outer ring assembly 100, an inner ring 200, a main push roller assembly 300, and a radial roller assembly 400.

The outer ring assembly 100 is coaxially sleeved on the inner ring 200, the main push roller assembly 300 and the radial roller assembly 400 are arranged between the inner ring 200 and the outer ring at intervals along the axial direction of the slewing bearing, and the inner ring 200 and the outer ring assembly 100 are in rolling connection through the main push roller assembly 300 and the radial roller assembly 400.

The main push roller assembly 300 includes a plurality of main push rollers 310, the plurality of main push rollers 310 are arranged along the circumferential direction of the inner ring 200 at intervals, a plurality of mounting grooves 110 are arranged on the outer ring assembly 100, and the plurality of main push rollers 310 are embedded in the plurality of mounting grooves 110 in a one-to-one correspondence manner. In this way, the retainer can be eliminated by restraining the main pushing roller 310 with the mounting groove 110. The structure of the slewing bearing is simplified, the utilization rate of the inner space is increased, the space of the retainer can be saved, the length and the number of the main push rollers 310 are increased, the integral bearing capacity of the slewing bearing is improved, and the problems of operation clamping stagnation, noise and the like caused by the initial abrasion of the retainer in the operation process are avoided.

The radial roller assembly 400 includes a plurality of balls 410 and a plurality of spacers 420, and the balls 410 and the spacers 420 are alternately arranged one by one in the circumferential direction of the inner ring 200. In this way, the balls 410 are restrained by the spacer 420, so that the cage can be eliminated.

Wherein inner race 200 on the side of radial roller assembly 400 facing away from main push roller assembly 300 is slidably coupled to outer race assembly 100. In this way, the sliding connection is used instead of the rolling connection, so that the cage can be dispensed with.

It should be noted that, the main push roller assembly 300 is mainly used for bearing axial force, the radial roller assembly 400 is mainly used for bearing radial force, and the inner ring 200 and the outer ring assembly 100 on the side of the radial roller assembly 400 facing away from the main push roller assembly 300 are slidingly connected to each other, so as to mainly be used for bearing overturning moment.

Fig. 3 is a partial enlarged view at a in fig. 1.

Referring to fig. 3, in order to limit deflection of the inner ring 200, the outer wall of the inner ring 200 on the side of the radial roller assembly 400 facing away from the main push roller assembly 300 is provided with a first engagement portion 210, the inner wall of the outer ring assembly 100 is provided with a second engagement portion 120 matching the first engagement portion 210, the first engagement portion 210 is slidably coupled with the second engagement portion 120, and the first engagement portion 210 is engaged with the second engagement portion 120.

It will be appreciated that the slewing bearing deflects the inner ring 200 as a whole under the action of a strong bending moment (overturning moment), that is, the axis of the inner ring 200 forms an angle with the axis of the outer ring assembly 100. By providing the first engaging portion 210 and the second engaging portion 120, the first engaging portion 210 and the second engaging portion 120 are engaged with each other, so that deflection of the inner ring 200 can be limited, local stress concentration caused by unbalanced load generated by the main push roller assembly 300 is prevented, and performance of bearing overturning moment of the slewing bearing is improved.

In one possible implementation, as shown in fig. 1, in order for the main push roller 310 to carry both axial and radial forces, thereby reducing the load on the radial roller assembly 400, the axial direction of the main push roller 310 is at an angle of no more than 45 ° to the horizontal.

It will be appreciated that the included angle is no greater than 45 in order that the main push roller 310 may be primarily subjected to axial forces.

The horizontal plane is the horizontal plane in fig. 1.

Illustratively, the angle between the axial direction of the main push roller 310 and the horizontal plane may be 45 °, or the angle between the axial direction of the main push roller 310 and the horizontal plane may be 30 °.

Fig. 4 is a schematic structural diagram of a main pushing roller in a slewing bearing according to an embodiment of the present utility model.

Referring to fig. 4, in order to avoid stress concentration, the main push roller 310 includes a main push roller body 311 and repair parts 312 provided at both ends of the main push roller body 311, the roller body being abutted against the inner ring 200.

It can be appreciated that by the modified portions 312 at both ends of the main push roller body 311, the edge stress concentration state is greatly reduced, and the load bearing state of the main push roller 310 is significantly optimized. At the same time, the shaping portion 312 and the mounting groove 110 cooperate to perform a bearing function.

Specifically, the modification 312 may be hemispherical or semi-ellipsoidal.

Fig. 5 is a partial enlarged view at B in fig. 4.

Referring to fig. 4 and 5, in one possible implementation, the busbar c of the main push roller body 311 includes at least one first arc, the inner ring 200 has a first raceway, the profile d of the first raceway includes at least one second arc, the first arc is disposed corresponding to the second arc, a midpoint of the first arc coincides with a midpoint of the corresponding second arc, when the first arc is a convex arc, the corresponding second arc is a concave arc, and a radius of curvature of the second arc is greater than a radius of curvature of the corresponding first arc. When the first arc is a concave arc, the corresponding second arc is a convex arc, and the curvature radius of the second arc is smaller than that of the corresponding first arc.

It is understood that when the first arc is plural, the bus bar c of the main push roller body 311 may be wavy. Moreover, when the first arc is N, the bus bar c of the main push roller body 311 has N contact points with the molded line d of the first raceway.

The inner wall of the mounting groove 110 is provided with a second raceway, the molded line e of the second raceway comprises at least one third arc, the first arc and the third arc are correspondingly arranged, when the first arc is a convex arc, the corresponding third arc is a concave arc, the midpoint of the first arc coincides with the midpoint of the third arc, and the curvature radius of the third arc is larger than that of the corresponding first arc. When the first arc is a concave arc, the corresponding third arc is a convex arc, and the curvature radius of the second arc is smaller than that of the corresponding first arc.

When the first arc is N, the bus c of the main push roller body 311 has N contact points with the molded line e of the second raceway.

Illustratively, the first arc is a convex arc and the number is one. In an initial state, the midpoint of the first arc coincides with the midpoint of the second arc, the midpoint of the first arc coincides with the midpoint of the third arc, the radius of curvature of the second arc is greater than that of the first arc, and the radius of curvature of the third arc is greater than that of the first arc, so that in the loaded rotation process, the first arc and the second arc have contact areas formed by elastic deformation of one contact point, other positions have gaps, the first arc and the third arc have contact areas formed by elastic deformation of one contact point, and other positions have gaps, thereby facilitating rotation of the main push roller 310 relative to the outer ring assembly 100 and the inner ring 200, and reducing abrasion of the main push roller 310.

When the number of the first arc, the second arc and the third arc is two or more, the contact point between the main push roller body 311 and the first roller path and the contact point between the main push roller body 311 and the second roller path become more, and the contact area is increased in the loaded rotation process, so that the bearing capacity of the main push roller 310 can be improved.

In order to increase the load bearing capacity of the main pushing roller 310, the entire main pushing roller 310 is quenched.

Referring to fig. 1, in order to increase the load bearing capacity, the number of main push roller assemblies 300 is two, and two main push roller assemblies 300 are disposed at intervals in the radial direction of the slewing bearing.

It should be noted that the number of the main push roller assemblies 300 may be three or more. Three, or more, of the main push roller assemblies 300 are spaced radially of the slewing bearing.

When the number of the main push roller assemblies 300 is two, the number of the first roller paths is two, an arc-shaped portion is connected between the two first roller paths, and the arc-shaped portion has a gap with the outer ring assembly 100.

When the axial force is large, the inner ring 200 and the outer ring assembly 100 are displaced and deformed, so that the arc portion abuts against the outer ring assembly 100, and thus, a part of the axial load can be carried by the cooperation of the arc portion and the outer ring assembly 100.

In one possible implementation, the number of main push roller assemblies 300 is two, and for ease of assembly of the slewing bearing, outer ring assembly 100 includes first outer ring 130, second outer ring 140, third outer ring 150, and flange 160.

The second engagement portion 120 is provided on an inner wall of the third outer ring 150, and the third outer ring 150 is in rolling connection with the inner ring 200 through balls 410.

The bottom surface of second outer ring 140 abuts against the top surface of third outer ring 150, the bottom surface of first outer ring 130 abuts against the top surface of second outer ring 140, the top surface of flange 160 abuts against the bottom surface of first outer ring 130, flange 160 is located in the area enclosed by inner ring 200, and the axes of first outer ring 130, second outer ring 140, third outer ring 150 and flange 160 are collinear.

The mounting groove 110 corresponding to one main push roller assembly 300 is formed by the second outer ring 140 and the first outer ring 130, and the mounting groove 110 corresponding to the other main push roller assembly 300 is formed by the first outer ring 130 and the flange 160.

In order to connect the flange 160 and the first outer ring 130, the slewing bearing further comprises a connecting piece, a first connecting hole is formed in the flange 160, a second connecting hole matched with the first connecting hole is formed in the first outer ring 130, the first connecting hole and the second connecting hole are correspondingly arranged, and the connecting piece is inserted into the first connecting hole through the second connecting hole.

In particular, the connection may be a screw or a connection pin.

Referring to fig. 1 and 2, the outer wall of the inner ring 200 is provided with a third sliding track, the inner wall of the third outer ring 150 is provided with a fourth sliding track corresponding to the third sliding track, the radial roller assembly 400 is located in an area surrounded by the third sliding track and the fourth sliding track, each ball 410 has two abutting points with the third sliding track, and each ball 410 has two abutting points with the fourth sliding track.

It will be appreciated that the radial roller assembly 400 employs a four-point contact ball bearing configuration that is more simplified than the radial roller assemblies of the related art. In use, the radial force is only a fraction of the axial force, so the structure is adopted to sufficiently satisfy the bearing of the radial force. In addition, the balls 410 have four contact points, so that the flexibility is high, and the axial force and the overturning moment can be shared. Thus, radial roller assembly 400 may cooperate with main push roller assembly 300 to enhance the load bearing capacity of the slewing bearing in both the axial and radial directions. Radial roller assembly 400 may cooperate with first engagement portion 210, second engagement portion 120 to enhance the overturning moment carrying capability of the slewing bearing.

It should be noted that the balls 410 and the spacer 420 may be balls 410 and spacer 420 commonly used in the related art, and the description of this embodiment is omitted herein.

In one possible implementation, the inner wall of the inner ring 200 is provided with bevel gears 500. Through the arrangement of the bevel gear 500, the slewing bearing can carry out crossed shaft transmission, the application fields (gear transmission, shaft transmission and the like) of the slewing bearing are increased, the slewing bearing is prevented from being restricted by working environments, and the practical value of the slewing bearing is not affected. Moreover, the bevel gear 500 structure has the characteristics of stable operation, low noise and the like, and the slewing bearing designed by the bevel gear 500 has the advantages of improving the practicability of the slewing bearing, avoiding damage due to large torque, reducing operation noise, avoiding noise pollution, improving the operation stability and being not easy to damage mechanical equipment.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The slewing bearing is characterized by comprising an outer ring assembly, an inner ring, a main push roller assembly and a radial roller assembly, wherein the outer ring assembly is coaxially sleeved on the inner ring, the main push roller assembly and the radial roller assembly are arranged between the inner ring and the outer ring at intervals along the axial direction of the slewing bearing, the inner ring and the outer ring assembly are in rolling connection through the main push roller assembly and the radial roller assembly, and the inner ring at one side of the radial roller assembly, which is away from the main push roller assembly, is in sliding connection with the outer ring assembly;

the main push roller assembly comprises a plurality of main push rollers, the main push rollers are arranged at intervals along the circumferential direction of the inner ring, the outer ring assembly is provided with a plurality of mounting grooves, and the main push rollers are embedded in the mounting grooves in a one-to-one correspondence manner;

the radial roller assembly comprises a plurality of balls and a plurality of isolation blocks, and the balls and the isolation blocks are alternately arranged one by one along the circumferential direction of the inner ring.

2. The slewing bearing of claim 1, wherein a first engagement portion is provided on an outer wall of the inner ring on a side of the radial roller assembly facing away from the main push roller assembly, a second engagement portion is provided on an inner wall of the outer ring assembly, the first engagement portion is slidably connected with the second engagement portion, and the first engagement portion is engaged with the second engagement portion.

3. The slewing bearing of claim 1, wherein an axial direction of the main thrust roller has an included angle with a horizontal plane, the included angle being no greater than 45 °.

4. A slewing bearing according to any one of claims 1 to 3, wherein the main push roller comprises a main push roller body and a trimming portion provided at both ends of the main push roller body, the roller body being abutted against the inner ring.

5. The slewing bearing of claim 4, wherein the generatrix of the main push roller body comprises at least one first arc, the inner ring has a first raceway, the profile of the first raceway comprises at least one second arc, the first arc is disposed corresponding to the second arc, the midpoint of the first arc coincides with the midpoint of the corresponding second arc, and the radius of curvature of the second arc is not equal to the radius of curvature of the corresponding first arc;

the inner wall of the mounting groove is provided with a second rollaway nest, the molded line of the second rollaway nest comprises at least one third arc, the first arc and the third arc are correspondingly arranged, the midpoint of the first arc coincides with the midpoint of the corresponding third arc, and the curvature radius of the third arc is not equal to the curvature radius of the corresponding first arc.

6. The slewing bearing of claim 5, wherein the number of main push roller assemblies is two, and two main push roller assemblies are arranged at intervals along the radial direction of the slewing bearing;

the number of the first rollaway nest is two, an arc-shaped part is connected between the two first rollaway nest, and the arc-shaped part and the outer ring component are provided with gaps.

7. The slewing bearing of claim 2, wherein the number of main push roller assemblies is two, the outer ring assembly comprising a first outer ring, a second outer ring, a third outer ring, and a flange;

the second meshing part is arranged on the inner wall of the third outer ring, and the third outer ring is in rolling connection with the inner ring through the balls;

the bottom surface of the second outer ring is in butt joint with the top surface of the third outer ring, the bottom surface of the first outer ring is in butt joint with the top surface of the second outer ring, the top surface of the flange is in butt joint with the bottom surface of the first outer ring, the flange is positioned in an area surrounded by the inner rings, and the axes of the first outer ring, the second outer ring, the third outer ring and the flange are collinear;

the mounting groove corresponding to one main push roller assembly is formed by the second outer ring and the first outer ring, and the mounting groove corresponding to the other main push roller assembly is formed by the first outer ring and the flange.

8. The slewing bearing of claim 7, further comprising a connecting piece, wherein a first connecting hole is formed in the flange, a second connecting hole matched with the first connecting hole is formed in the first outer ring, the first connecting hole is arranged corresponding to the second connecting hole, and the connecting piece is inserted into the first connecting hole through the second connecting hole.

9. The slewing bearing of claim 7, wherein a third slideway is arranged on the outer wall of the inner ring, a fourth slideway corresponding to the third slideway is arranged on the inner wall of the third outer ring, the radial roller assembly is positioned in an area surrounded by the third slideway and the fourth slideway, two propping points are arranged between each ball and the third slideway, and two propping points are arranged between each ball and the fourth slideway.

10. A slewing bearing according to any one of claims 1-3, characterized in that the inner wall of the inner ring is provided with bevel gears.